Washer.



W. E@ CFFIN. j

WASHER.

APPLICATION FILED MAR. 31, 190e.

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Patented Mar. 8, 1910.

NI'I STATE@ PATENT @FENCE WALTER E. COFEIN, OF CLEVELAND, OHIO, ASSIGNORTO THE NATIONAL MALLEABLE CASTINGS COMPANY, OF CLEVELAND, OHIO, ACORPORATION OF OHIO.

WASHER.

To all whom it may concern:

Be it known that I, W'ALTER E. COFFIN, of Cleveland, county of Cuyahoga,and State of Ohio, have invented a new and useful Improvement inlVashers, of which the following is a speciiication, reference being hadto the accompanying drawing, in which- Figure l is a plan view of thewasher, the position of the nut thereon being indicated by dotted lines.Fig. 2 is a vertical cross section on the line II-II of Fig. l showingthe washer and nut in conjunction.

As shown in the drawing of the washer, 2 is a cast washer, preferably amalleable iron casting, having a broad base 3 with strengthening ribs 4which extend radially on the washer. The washer has the usual centralhole 5 and around this hole on top of the washer is a Hat bearingsurface 6, preferably annular in form, and the portions of the ribs 4which are contiguous to the bearing surface 6 and which are marked 4 arealso made flat on the top on the same level with the annular portion 6.When the nut is screwed home on the washer it will have a Hat bearing onthe annular surface 6 the diameter of which is preferably about equal tothe shortest width of the nut. The diagonal dimensions of the nutproject beyond the annular bearing surface 6, thus having Specificationof Letters Patent.

Application led March 31, 1908.

Serial No. 424,302.

a bearing upon the flat ribbed portions 4. In this way the nut has asubstantial bearing upon the washer and the washer is made of thegreatest possible strength compatible with the weight of the materialused in its construction. If desired, the radius of the annular bearingsurface 6 may be somewhat less than the shortest width of the nut7 butthe construction which I have shown in the drawing is preferable.

I claim:

A washer having its bolt opening surrounded by a single circular `flangewhose edge forms a flat bearing surface for the shorter dimension of thenut, and integral radial ribs extending outwardly from said flange, theinner end portions of the ribs being flat extensions ot the liangebearing and in the saine plane for a distance sutiicient to engage thelonger dimension of the nut and form the sole bearing for its corners,and thence tapered downwardly toward the washer body; substantially asdescribed.

In testimony whereof, I have hereunto set my hand.

WALTER E. COFFIN. Witnesses:

HENRY F. Porn, HARRY E. ORR.

Patented Mar. 8, 19910.

